三明市辖区大白菜氮磷钾推荐施肥指标研究

通过田间试验研究大白菜氮磷钾肥料效应，建立福建省三明市辖区大白菜养分丰缺指标及其施肥指标体系。试验表明：试验地基础地力贡献率为39.22%~83.75%，大白菜施用氮、磷、钾肥料增产率分别为28.50%、5.33%和9.05%，其增产效果为N＞K＞P。当地大白菜土壤碱解氮、有效磷和速效钾养分含量高的临界指标分别为260、42、172 mg/kg；低的临界指标分别为188、12、66 mg/kg。当地大白菜最高产量施氮量为(287.71±77.50) kg/hm²，氮磷钾施肥配比为1:0.09:0.84；最佳经济产量施氮量为(274.52±75.92) kg/hm²，氮磷钾施肥配比为1:0.07:0.85。

Recommended Nitrogen, Phosphorus and Potassium Application Amount forChinese Cabbage in Sanming City

By studying NPK fertilizer effect on Chinese cabbage in field experiment, the nutrient enrichment and paucity index and fertilization system in Sanming City were built. The results showed that: the contribution rate of soil fertility to Chinese cabbage was 39.22% to 83.75%, the growth rate of Chinese cabbage was 28.50%, 5.33% and 9.05% with the application of N, P and K, and the yield-increasing effect was N>K>P. The highest index of alkali-hydrolyzable N, available P and available K of local Chinese cabbage soil was 260, 42 and 172 mg/kg, respectively; and the lowest index was 188, 12 and 66 mg/kg, respectively. The maximum application rate of N for the local Chinese cabbage was (287.71 77.50) kg/hm², the application ratio of NPK was 1:0.09:0.84; the N application amount with the best economic yield was (274.52 75.92) kg/hm², and the application ratio of NPK was 1:0.07:0.85.